Compound brake.



PATENTED APR. 2, 1907.

A. SUNDH. COMPOUND BRAKE. APPLICATION FILED JUNE 19, 1905.

WITNESSES ATTORNEY UNITED STATES PATENT OFFICE.

AUGUST SUNDH, OF YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, OF JERSEY CTTY, NEV JERSEY, A CORPORATION OF NEW JERSEY.

COMPOUND BRAKE.

Specification of Letters Patent.

Patented April 2, 1907.

. Application filed June 19,1905- Serial No. 265,995.

To (all 1071 0121 it mil-y concern:

Be it known that 1, AUGUST SUNDH, a citizen of the United States, residing at Yonkers, in the county of VVestchester and State of New York, hav invented a new and useful Improvement in Compound Brakes, of which the following is a specification.

My invention relates to brakes, and has for its object the provision of means for applying primary braking members and utilizmg the moving force of the driving means for applying secondary braking members adjacent the primary members, thereby producing a powerful compound brake, which requires a comparatively small power to set the brakes.

A further object of my invention is to provide primary and secondary braking members for the rim of a single friction-pulley and limit-inc substantially all the strain thereon to a circumferential tension.

Another object is to provide a compound and is similar in its action to that disclosed in the patent to Sundh and Lindquist, 772,005, October 11,1904, hoisting apparatus; in the patentto Sundh, 757,782), April 19, 1904, elevator-brake mechanism, and in my copending, applicai ion, Serial No. 240,613, filed January 11, 1905, elevator-brakes. the two patents and the application mentioned, however, the secondary braking members are not adjacent the primary members, but are. applied to a hoisting drum or drums, whereab in the present construction both the primary and secondary braking members are arranged opposite each other and applied tothesame device, in this instance the rim of a friction-pulley.

Referring now to the drawings, showing the brake mechanism in elevation, 54 designates a bedplate, to which is secured the bearing 38 for the driving-shaft of a motor. To the power-transmitting, shaft 10 is keyed or otherwise rigidly fastened a frictionpulley 11, having a broad rim 12, which is adapted to coact with the brake-shoes.

A double rocker-arm 13 is mounted loosely upon the shaft 10 and kept in place thereon by being connected to the magnetframe l t by means of the bolts 17 17 and lock-nuts 18 18, respectively. An antifriction-metal bushing separates the shaft 10 from this rocker-arm and magnet-frame 14. Means for lubricating the shaft and bushing are indicated at 16.

The lower part of the magnet-frame 14 contains a SOlBIlOlu 19, within which is a plunger or movable core 20, having a disk 23 rigidly attached to its lower end. Bet-ween the lower end of the magnet-frame- 14 and this disk, so as to surround the lower end of the plunger 20. are placed the springs 21, and 2.2, one w thin the other. These springs which thus encircle the plunger press against the lower portion of the magnet-frame 14 and the disk 23 to force the plunger in a downward direction.

Primary brake-levers 27 27 are pivoted at 28 28, respectively, to the extreme ends of the double rocker-arm 13. The primary brake-shoes .29 29 are pivoted upon the levers 27 27at the intermediate points 30 30', respectively. Fastened to the lower end of the plunger 20 by means of the. pin 24 are two toggle-links and. 25, which serve to transmit any motion of the plunger 20 to the primary brakelevers l7 2", these links being connected to the brake-levers at :36 26, respectively.

Leaf-springs 31 31 are. interposed between a flattened portion 53 on the shoes 29 29 and the levers 27 '27 adjacent the pivotal points 30, respectively. The eil'ect 'of this construction is that the brake-slices 29 29' are normally held out of contact with the friction-pulle 12.

Integra with the bearing standard or support 38 or suitably secured thereto are two rejecting lugs 37 37, to which are pivoted,

y means of the pins 36 and 36, the secondarybrake-levers 32 and 32, respectively. These additional brake-levers have pivoted to them by means of the'pins 34 34' the-secondary brake-shoes 3'3 33. The additional brake-shoes 33 33 are also provided with g the ends of the slot 51.

flattened portions 52, against which bears a flat spring 35, engaging at its ends the brakelevers 32 32. The springs between the brake-levers and brake-shoes tend to overcome any tilting of the shoes when the same are released from thcl face of'the pulley 11 as Well'as hold said shoes normally out of contact with the rim 12 of the pulley.

At the upper ends of the brake-levers 32 32 are shown two lugs 40 40, the latter being provided with enlarged holes through which passes the bolt 4]. Between the lugs and on this bolt is mounted a compressionspring regulated'by the-nut 42. The spring tends to move the brake-levers 32 32 apart; but this movement is limited by the head of the bolt and by the nut 42.

The extreme ends of the brake-levers 32 32 are provided with pins 43 43, which enter and areadapted to slide in the slot 51 of a link-plate 44. This link-plate 44 is connected to the' rocker-arm 13 by means of two turnbuckles comprising the couplings 49 49 and the link members 50 50 and 48 48. In this instance the links 50 50 are pivoted at their upper ends to pins 45 45, which are secured to the lower portion of the link-plate 44. The links 48 48 are slotted at their lower ends to receive the pins 46 46, pro- {ecting from the rocker-arm 13. The coupings 49 49 are of course right and left hand screw-threaded and fit oncorresponding screwthreaded ends of the aforementioned links.-

The outward movement of the brake-levers 32 32 is adjustably limited by the bolthead and nut, but are positively limited by The shoes 33 33 may be brought closer to the rim 12 of the pulley by turning the couplings 49 49; but the main purpose of these couplings is to vary the application of the secondary shoes after the primary shoes have been applied. When the parts are properly adjusted, they will appear as in the figure-that is, the spring 39 will be able to hold the shoes 33 33 in their releasing position and transmit a tension through thelink-plates 44 and the turnbuckles so that the secondary shoes shall be applied immediately after the primary shoes are applied.

It will be noticed that all parts are symmetrically arranged, so that the brake will operate equally as well whether the pulley is rotatin in one direction or the other. I prefera ly place the pins 46 46 nearer to the shaft 10 than to the pivotal points 28 28, so that the secondary shoes shall be applied a very short time after the primary shoes are set, and, furthermore, so asto obtain a substantial diametral pull on the secondar brake-levers, the turnbuckles being for all practical purposes in such position as to aply nearly equal braking action on the shoes 33 33.

loosely in the slot 47.

The operation of my device is [as follows: Let it be assumed that the magnet 14 is en.- ergized so that the plunger 20 is raised-against the action of the springs 21 and 22 and exerts a pull on thetoggle-links 25 25 to'rock the brake-levers 27 27 about the pins .28 28'. The brake-shoes 29 29 will then beheld in their releasing position, as'shown, and their outer surfaces will be maintained concentric by the springs 31 31 bearing on the flattened portions 53 of the shoes. The-pulley is now free to revolve. Supposing the pulley to be revolving in a clockwise direction. let it bedesired to a ply the brakes. The first operation would be to interrupt-the circuit through the solenoid 19, whereupon the springs 21and 22 would act through the toggle-joint at 24 to force the levers 27 27 outwardly, thus applying the primary brakeshoes 29 29 against the inner surface or periphery of the rim 12 of the pulley 11, the pins 28 28 serving as fulcrums for. the levers 27 27. Since the double rocker-arm 13 is mounted loosely on the shaft 10 and the magnet-frame 14is rigid with said rocker-arm, the latter will be turned in a clockwise direction and effect the application of the secondary brake-shoes on the outer surface or periphery of the pulley-rim 12. When the prlmary brake is applied, the friction between the shoes and the inner surface of the pulley-rim is sufiiciently great to exert strong pulls on both the arms of the rocker-arm 13,- but in opposite directions, the rocker-arm being thereforerotated about the shaft 10. The result of this action is that the pin 46 places the turnbuckle at the right in tension, which is transmitted to the link-plate 44 and. thence t'hrou 11 the pins 43 43 to both brake-levers 32 32 The latter will be drawn together, the pins 36 36 being the fulcrumpoints, and the secondary brake-shoes 33 33- will be applied to the outer surface or periphery of the pulley-rim 12 with great force.

It will be seen that the primary and second ary brake-shoes are placed opposite each other. This is for the urpose of preventing undue strain on the pulley-rim, which might occur if the brake should be suddenly and very forcibly applied either to the outer surface alone or to the inner surface alone. I therefore not only secure greater, braking action, due to a greater area of frictional engagement and an accumulation of. power transmission, but also neutralize any diametral strains on the pulley-rim. and limitthe strain thereon to a circumferential tension.

When the rocker-arm is moved in a clockwise direction, the pin 46 moves loosely in the slot 47. If the rocker-arm rotates in the opposite direction, the pin 46 would ride In either case the link-plate 44 would be placed in tension to mtdi the brake-levers 32 32 toward each other against the action of the spring 39, the l tional brake for said moving member, and

pins 43 43 bcing'allowed free play in the slot 51. In case the pulley rotated in a clockwise direction and the brakes were applied the pin 43 would remain in the end of its slot, but the link-plate 44 would obviously be moved a short distance to the right and downwardly, so that the pin 42 would take a position to the left of the end of the slot 51 after the secondary shoes were applied.

\Vhen it is desired to release the pulley ahd the driving-shaft to which it is secured, the magnet is energized, whereupon the shoes 29 29 will be removed from contact with the inner? surface of the pulley-rim 12. The rocker-arm will now be free to,rotate. Tension will be exerted by the spring 39 through the link-plate 4-1 and the right-hand turnbuckle in an opposite direction to that therein exerted before to rotate the rocker-arm' back to its normal position. At the same time the secondary brake-shoes will be moved away from the outer surface of the pulleyrim, so that the shaft and pulley will then be free to revolve. It will thus be. seen that the spring 3.) acts asa centering device to restore the brakes to normal position upon the energization of the magnet 14.

It is to be noted that I have shown two springs 21 land 22 for setting the primarybrakes; but only one spring maybe used, if desired it is preferable, however, to employ two springs, each of suilicient strength to apply the primary brakes and hold it applied, so that it one spring should break or become otherwise deranged the other could be relied upon for the proper operation-of both brakes. Furthermore, the arrangement shown includes a double primary brake and a double secondary brake, such that if one of the primary brakes becomes inoperative the other would be sullicient to effectively apply the secondary brakes. .So, also, if one of the secondary brakes becomes inoperative the other could still be applied. In other words, either primary brake is able by its impressed motion, due to its frictional contact with the pulley-rim, to actuate intermediatclconnections, and thus effect the application of either one or both of the second ary brakes. double arrangement of setting springs and brakes is not only an increase in braking power, but also a safeguard against cmergencies so far as derangement of the braking mechanism is concerned.

Havingthus full described my inyention so that any oneski led in the art may make, use, and construct the invention and without limiting myselfto any of the details of construction or' arrangement of parts, what I claim, and desire to have protected by Letters Patent of the United States, is-

1. The combination with a moving member, of a brake associated therewith, an addi- The result, therefore, of the.

means for effecting the application of said additional brake after, the setting of said first-named brake.

2. The combination with a moving member, of a brake therefor, an additional brake opposite said first-named brake, and means coacting with said first-named brake for effecting the ap lication of said additional brake after the n'stnamcd brake is applied.

3. The combination with a moving member, of a brake therefor on one side of said member, an additional brake opposite said first-named brake and on the opposite side of said member, and means coacting with said first-named brake after the setting thereof for applying said additional brake.

4. The combination with a rotating member, of a primary brake therefor, a secondary brake for said rotating member, and means for-applying said secondary brake from said primary brake after the application of the latter.

5. The combination with a rotating member, of an inner primary brake therefor, an outer secondary brake opposite. said primary brake, and connections for effecting the application of the secondary brake after the setting of the rimary brake.

6. '1 he coin )ination with a moving member, of a double brake therefor, of an additional double brake adjacent said firstnamed brake, and connections for effecting the application of said additional double brake upon the application of said firstnamed double brake.

7. The combination with a moving member, of a primary double brake, a secondary double brake adjacent said rimary double brake, and means coacting with the primary double brake for applying the secondary double brake.

8. The combination with a rotating member, of an inner primary double brake, an

outer secondary double brake, and connections between said brakes.

9. The combination with a moving member, of a brake associated therewith and movable in the direction of motion of said member, an additional brake in close proximity to said first-named brake, and means for fl'ecting the application of said additional brake to said member when said first-named brake is applied.

1(). The combination with a moving member, of a brake associated therewith and movable in the direction of motion of said member, an additional brake in close proximity to said first-named brake, and means for efi'ecting the application of said additional brake to said member upon the setting of said firstnamed brake.

11. The combination with a moving member, of a brake associated therewith andmovable in the direction of motion thereof m additional brake opposite said first-named brake, and means effecting the ap lication of said additional brakewhen said st-named brake is applied.

12. The combination of a moving member and two devicesarranged opposite each other and on opposite sides of said moving, member for retarding the motion of said member, one of said devices being brought into operation by the other device through frictional engagement of the latter with said member.

13. The combination with a rotating member, of a device for retarding the motion thereof, an additional device for retarding the motion of said member, and means coacting with the first-named device for bringingthe said additional device into operation through the frictional engagement of said first-named device with said rotating mem- 14. The combination with a moving member, of a brake associated therewith and movable in the direction of motion of said member, and a second brake adjacent said firstnamed brake and actuated by the impressed motion thereof due to its frictional contact with said moving member.

15. The combination with a moving member, of a brake associated with a portion of said moving member and movablein the direction of motion'of said member, and a second brake associated with an opposite portion of said moving member and actuated by theimpressed motion of said first-named brake due to its frictional engagement with said movingv member.

16. The combination with arotating member, of an inner primary brake movable in the direction of motion of said member, an outer secondary brake opposite said primary brake, and means for effectin the application of said additional brake w ien said firstnamed .brake is applied.

17. The combination with a rotary member, of a brake for acting thereon, a support for said brake constructed to move around the axis of-said member, and a secondbrake for said member and actuated by the imressed movement of said su port' due 'to' Frictional engagement of sai first-named brake with said member.

18. The combination with a rotary shaft, of a friction-pulley on said shaft, a brake associated with said friction-pulley and movable in the direction of rotatioh thereof, an additional brak for saidv pulley, and means actuated by the impressed movement of said first-namedbrake'due to frictional engagement of the first-named brake witlr'thesaid friction-pulley for applying said additional brake to said pulley.

19. The combinaion with a rotary frictionpulley, of means'for'retarding the motion of said pulley ,and movable around the axis thereof, andadditional means for retarding the motion of said pulley, said additional means being operated by the impressed rotary movement of said first-named means.

20. The combination with a rotary shaft, of a friction-pulley thereon, arms connected at one end by a joint, brakes on said arms bearing on the pulley, means for normally forcing the arms apart to move said brakes into contact with said pulley, a support for said arms, and electromagnetic means carried I by said support for forcing togetherv said arms and relieving the brake-pressure.

21. The combination with a rotary shaft, of a friction-pulley on said shaft, a frame loose on said shaft, a brake supported by said frame and bearing on said pulley, an additional brake, and connections between said frame andsaid additional brake for effecting the a lication of the latter when the frame is tilted liy the frictional engagement of said first-named brake with said ulley.

22. The combination with a rotary shaft, of a friction-pulley on said shaft, arms connected by a joint at one end, brakes supported on said arms and bearing on said pulley, means for moving said arms to release or apply said brakes, a support for said arms constructed to permit the same to tilt in the direction of rotation of said pulley, an addi tional brake associated with said pulley, and means actuated by the tilting of saidsupport and arms due to frictional engagement of i said first-named brakes for effecting the application of the additional brake.

23.. The combination with a rotary shaft, of a friction-pulley thereori, arms connected by a joint at one end, brakes supported by said arms and associated with said pulley, one or more springs for-moving said arms to brakeapplying position, an electromagnetic device for releaslng said brakes, a support for said arms constructed to permit the same to tilt in the direction of rotation of said pulley, an additional brake for said pulley, and brakeapplyin means for said additional brake actuate by the tilting of said arms due to frictional engagement of said brakes.

.of a friction-pulley secured thereto, a brake for application to the inner periphery of the pulley-rim, a su port for said brake loose on.

said shaft, an adc itional brake for application to the outer periphery of the pulley-rim, and

connections between said outer brake and said support for the inner brake, the outer brake being controlled by the displacement of said support in are due to the frictional contact between the inner brake and the Pillley-rim.

25. The combination with a rotary shaft, of afriction-pull y thereon, a brake associated with the inner p ieriphery of the pulley-rim, a support for said brake loose on said shaft, an additional brake associated with the outer periphery of the pulley-rim, and means for ber, of a device for retarding the motion 0 erating said additional brake controlled by t e displacement of said support in are due to the frictional contact of the st named brake with the inner periphery o the pulleyr of a double rocker-arm loose thereon, a solenoid connected to said rocker-arm, a brakepulley on said shaft, levers pivoted on said rocker-arm and. controlled by said solenoid,

brakes acting on said pulley and controlled by said levers, additional brakes acting on said pulley, and means controlled by the disreleasing said first-named brake, and means for restoring both of the brakes to normal.

28. The combination with a movable member, of'a brake associated therewith, an additional brake for said movable member, means for eflecting the application of said additional brake upon the'settin'g of said first named brake, electromagnetic means for releasing the prima brake, and means for restoring both of sai brakes to normal'position upon the operation of said electromagnetic means.

29. The combination with a movable member, of'a brake therefor, an additional brake for said member, means coaeting with said first-named brake for applying said additional brake, means for releasing said first-named brake, and means coactin with said brakeapplying means of said additional brake for restoring both brakes to normal.

30. The combination with a movable memthereof, an additional device for retarding the motion of said member, means coacting with the first-named device for bringing saidadditional device into 0 eration through the frictional engagement 0 said first-named device with sald movable member, and means for restoring said brakes to normal position. Y

31.- The combination with a rotating member, of a primary brake therefor, means for applying said brake, a secondary brake, means coat-ting with the primary-brake-ap plying means for applying said secondary rake, and a s ring or restoring said brakes to their norma positions.

32. The combination with a rotating shaft,

of a friction-pulley thereon, a primary brake 26. The combination with a rotary shaft,.

to act on said pulley, a rocker-arm loose on said shaft, a brake-lever supported by said rocker-arm and supporting said brake, means for moving said lever to apply said primary brake, a secondary brake, an additional brake-lever therefor, connections. between said rocker-arm and additional brake-lever, electromagnetic means for releasing said primary brake, and a single restoring means for both of said brakes.

33. The combination with a rotating shaft, of a friction-pulley tln eon, a double rockerarm loose on said shaft, primary brake-levers supported by said rockerarm, primary brakeshoes supported by said levers and associated with the inner periphery of the pulley-rim, means for moving said primary brake-levers to apply said primar: orake-shoes, secondary brake-levers, secondary brake-shoes supported thereby and associated with the outer periphery of the pulley-rim opposite said primary brake-shoes, adjustable connections between said rocker-arm and said secondary brakelevers, electroma netic means for releasing the primary bra e levers and shoes, and a spring associated-with the free ends of said secondary brake-levers'for restoring the same to normal and for coacting with said adjustable connections to rotate said rockerarm to normal position.

34. The combination with a moving member, of a brake theref r, electromagnetic means .for releasing said brake, and a lurality of concentrically-arranged springs or applying said brakes.

35. The combination with a moving member, of meansfor retarding the motion thereof, a plurality of concentrically-arranged springs for operating said retardin means, and means for releasing said retar ing means.

36. The combination with a moving member, of a brake therefor, a solenoid, a plunger for said solenoid, a plurality of'independent springs surrounding one end of said plunger, and means for connecting said brake and plunger.

37. The combination with a brake-pulley, of aprimary brake and a secondary brake for said pulley, a solenoid a plunger for said solenoid, a plurality of independent springs for moving said plunger, and connections between said plungers-and said brakes.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

AUGUST sUNDu.

Witnesses.

CHARLES M. NIssEN, Joan O. G. Ross.

ICC 

